| The state of the Arctic climate system during the first decade of XXI century and during the
IPY 2007/08 are considered and compared with one during the previous periods
and with estimates of the global climate models. Although the Arctic had been
warmed over the past three decades as well as the globe the changes in the Arctic are
amplified whereas the climate models underestimate of the Arctic warming. The
experimental data collected during the IPY 2007/08 and other field campaigns provides
evidence for new sites of interaction between the ocean and atmosphere in the Arctic
involving the sea ice, radiation and CO2 fluxes. Significant changes in the vertical
structure of the Arctic atmosphere (e.g. distribution of the humidity, cloudness, heat
fluxes) are indicative of the changes in radiative properties of the air column and
snow/ice surfaces. Observations from North Pole drifting ice stations show that
during ice growth in the central Arctic Ocean, CO2 is emitted. Recent data from the
Arctic show some slowdown of the warming that might be a result of the natural
influence. The report presents some results on processes study in the Arctic climate
system, comparison of observed and modeled climate change, quantification of the
feedbacks and contribution of anthropogenic and natural forcing to the arctic warming. |